MC912D60AVPVE8 Datasheet, PDF (104/460 Pages) Freescale Semiconductor, Inc – HC12 Microcontrollers

Flash Memory
7.11 Flash protection bit FPOPEN
The FPOPEN bit is located in EEMCR – EEPROM Module Configuration
Register, bit 4.
FPOPEN – Opens the Flash array for program or erase
0 = The whole Flash array (32-Kbyte and 28-Kbyte) is protected.
1 = The whole Flash array (32-Kbyte and 28-Kbyte) is enabled for
program or erase
FPOPEN can be read at anytime.
FPOPEN can be written only to ’0’ for protection but not to ’1’ for un-
protect in normal mode.
FPOPEN can be written ’0’ and ’1’ in special mode only.
FPOPEN is loaded at reset from EEPROM SHADOW word bit 4.
When FPOPEN is cleared to ’0’, the Flash array cannot be
reprogrammed in normal modes.
CAUTION:
Programming the NVM FPOPEN bit in the SHADOW word ($_FC0, bit
4) means that the FPOPEN bit in the EEMCR register will always be ’0’
in normal modes. The flash array can no longer be modified in normal
modes.
Technical Data
104
Flash Memory
MC68HC912D60A — Rev. 3.1
Freescale Semiconductor